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Cheap flights from St. Louis to Sofia from $290

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Sofia departing on 10/11. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from St. Louis to Sofia

Cheap round-trip flights

Enter your travel dates to find the best prices.
Lufthansa Logo
1:08 pm - 10:55 pmSTL  Lambert-St Louis-SOF Sofia
25h 47m2 stops Chicago O'Hare Intl Munich Franz Josef Strauss
Lufthansa Logo
6:25 am - 1:45 pmSOF  Sofia-STL Lambert-St Louis
15h 20m1 stop Frankfurt am Main
$746Lufthansa
Mon, Feb 1 - Fri, Feb 5
Multiple Airlines Logo
7:04 pm - 10:55 pmSTL  Lambert-St Louis-SOF Sofia
19h 51m2 stops Chicago O'Hare Intl Munich Franz Josef Strauss
Multiple Airlines Logo
6:25 am - 3:26 pmSOF  Sofia-STL Lambert-St Louis
41h 01m2 stops Frankfurt am Main Toronto Pearson Intl
$754Multiple Airlines
Mon, Feb 1 - Fri, Feb 5
United Airlines Logo
1:00 pm - 1:15 pmSTL  Lambert-St Louis-SOF Sofia
16h 15m2 stops Washington, D.C. Dulles Intl Munich Franz Josef Strauss
United Airlines Logo
6:25 am - 10:06 pmSOF  Sofia-STL Lambert-St Louis
23h 41m2 stops Frankfurt am Main Houston George Bush Intcntl
$779United Airlines
Mon, Jan 25 - Thu, Jan 28
United Airlines Logo
1:08 pm - 1:15 pmSTL  Lambert-St Louis-SOF Sofia
16h 07m2 stops Chicago O'Hare Intl Munich Franz Josef Strauss
United Airlines Logo
6:25 am - 11:09 pmSOF  Sofia-STL Lambert-St Louis
24h 44m2 stops Frankfurt am Main Chicago O'Hare Intl
$779United Airlines
Mon, Jan 25 - Thu, Jan 28
Multiple Airlines Logo
11:25 am - 1:25 pmSTL  Lambert-St Louis-SOF Sofia
18h 00m3 stops Chicago O'Hare Intl Toronto Pearson Intl Frankfurt am Main
Multiple Airlines Logo
6:25 am - 3:26 pmSOF  Sofia-STL Lambert-St Louis
41h 01m2 stops Frankfurt am Main Toronto Pearson Intl
$798Multiple Airlines
Mon, Feb 1 - Fri, Feb 5
Lufthansa Logo
6:53 pm - 10:50 pmSTL  Lambert-St Louis-SOF Sofia
19h 57m2 stops Chicago O'Hare Intl Frankfurt am Main
Lufthansa Logo
6:20 am - 1:25 pmSOF  Sofia-STL Lambert-St Louis
15h 05m1 stop Frankfurt am Main
$853Lufthansa
Wed, Sep 9 - Wed, Sep 16
Lufthansa Logo
8:40 am - 6:40 pmSTL  Lambert-St Louis-SOF Sofia
26h 00m2 stops Washington, D.C. Dulles Intl Munich Franz Josef Strauss
Lufthansa Logo
6:20 am - 1:25 pmSOF  Sofia-STL Lambert-St Louis
15h 05m1 stop Frankfurt am Main
$858Lufthansa
Wed, Sep 9 - Wed, Sep 16
Air Canada Logo
11:25 am - 1:25 pmSTL  Lambert-St Louis-SOF Sofia
18h 00m3 stops Chicago O'Hare Intl Toronto Pearson Intl Frankfurt am Main
Air Canada Logo
6:25 am - 9:13 pmSOF  Sofia-STL Lambert-St Louis
22h 48m3 stops Frankfurt am Main Toronto Pearson Intl Chicago O'Hare Intl
$862Air Canada
Mon, Feb 1 - Fri, Feb 5
Multiple Airlines Logo
8:55 am - 12:10 pmSTL  Lambert-St Louis-SOF Sofia
19h 15m2 stops Toronto Pearson Intl Munich Franz Josef Strauss
Multiple Airlines Logo
2:20 pm - 1:25 pmSOF  Sofia-STL Lambert-St Louis
31h 05m1 stop Frankfurt am Main
$872Multiple Airlines
Mon, Sep 7 - Mon, Sep 21
Air Canada Logo
8:55 am - 12:10 pmSTL  Lambert-St Louis-SOF Sofia
19h 15m2 stops Toronto Pearson Intl Munich Franz Josef Strauss
Air Canada Logo
2:20 pm - 6:41 pmSOF  Sofia-STL Lambert-St Louis
36h 21m2 stops Frankfurt am Main Montreal Pierre Elliott Trudeau Intl
$959Air Canada
Fri, Oct 9 - Mon, Oct 12

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Air Canada flights from St. Louis to Sofia

Our best Air Canada deals on St. Louis to Sofia flight tickets
Air Canada
Feb 1
STL11:25 amLambert-St Louis
18h 00m
3 stops
SOF1:25 pmSofia
Feb 5
SOF6:25 amSofia
22h 48m
3 stops
STL9:13 pmLambert-St Louis
$862
Air Canada
Dec 16
STL9:40 amLambert-St Louis
19h 45m
3 stops
SOF1:25 pmSofia
Dec 25
SOF2:10 pmSofia
28h 36m
3 stops
STL10:46 amLambert-St Louis
$1,101

Lufthansa flights from St. Louis to Sofia

Our best Lufthansa deals on St. Louis to Sofia flight tickets
Lufthansa
Feb 1
STL1:08 pmLambert-St Louis
25h 47m
2 stops
SOF10:55 pmSofia
Feb 5
SOF6:25 amSofia
15h 20m
1 stop
STL1:45 pmLambert-St Louis
$746
Lufthansa
Sep 9
STL6:53 pmLambert-St Louis
19h 57m
2 stops
SOF10:50 pmSofia
Sep 16
SOF6:20 amSofia
15h 05m
1 stop
STL1:25 pmLambert-St Louis
$853
Lufthansa
Sep 9
STL1:00 pmLambert-St Louis
21h 40m
2 stops
SOF6:40 pmSofia
Sep 16
SOF6:20 amSofia
15h 05m
1 stop
STL1:25 pmLambert-St Louis
$858

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Sofia that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated August 9, 2026.
Use the filters below to find and compare flights from St. Louis to Sofia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisSofia

STL Lambert-St Louis - SOF Sofia

STLSOF

Lambert-St Louis

Mon 2/1

1:08 pm-10:55 pm

2 stops25h 47m

Sofia

Fri 2/5

6:25 am-1:45 pm

1 stop15h 20m

$746

St. LouisSofia

STL Lambert-St Louis - SOF Sofia

STLSOF

Lambert-St Louis

Mon 2/1

7:04 pm-10:55 pm

2 stops19h 51m

Sofia

Fri 2/5

6:25 am-3:26 pm

2 stops41h 01m

$754

St. LouisSofia

STL Lambert-St Louis - SOF Sofia

STLSOF

Lambert-St Louis

Mon 1/25

1:00 pm-1:15 pm

2 stops16h 15m

Sofia

Thu 1/28

6:25 am-10:06 pm

2 stops23h 41m

$779

St. LouisSofia

STL Lambert-St Louis - SOF Sofia

STLSOF

Lambert-St Louis

Mon 1/25

1:08 pm-1:15 pm

2 stops16h 07m

Sofia

Thu 1/28

6:25 am-11:09 pm

2 stops24h 44m

$779

St. LouisSofia

STL Lambert-St Louis - SOF Sofia

STLSOF

Lambert-St Louis

Mon 2/1

11:25 am-1:25 pm

3 stops18h 00m

Sofia

Fri 2/5

6:25 am-3:26 pm

2 stops41h 01m

$798
Quickest round-trip

St. LouisSofia

STL Lambert-St Louis - SOF Sofia

STLSOF

Lambert-St Louis

Wed 9/9

6:53 pm-10:50 pm

2 stops19h 57m

Sofia

Wed 9/16

6:20 am-1:25 pm

1 stop15h 05m

$853

St. LouisSofia

STL Lambert-St Louis - SOF Sofia

STLSOF

Lambert-St Louis

Wed 9/9

8:40 am-6:40 pm

2 stops26h 00m

Sofia

Wed 9/16

6:20 am-1:25 pm

1 stop15h 05m

$858

St. LouisSofia

STL Lambert-St Louis - SOF Sofia

STLSOF

Lambert-St Louis

Mon 2/1

11:25 am-1:25 pm

3 stops18h 00m

Sofia

Fri 2/5

6:25 am-9:13 pm

3 stops22h 48m

$862

St. LouisSofia

STL Lambert-St Louis - SOF Sofia

STLSOF

Lambert-St Louis

Mon 9/7

8:55 am-12:10 pm

2 stops19h 15m

Sofia

Mon 9/21

2:20 pm-1:25 pm

1 stop31h 05m

$872

St. LouisSofia

STL Lambert-St Louis - SOF Sofia

STLSOF

Lambert-St Louis

Fri 10/9

8:55 am-12:10 pm

2 stops19h 15m

Sofia

Mon 10/12

2:20 pm-6:41 pm

2 stops36h 21m

$959

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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How to get the cheapest flight ticket from St. Louis to Sofia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between St. Louis and Sofia?

Prices are currently typical for flights on this route.

Typical prices usually range from $672 to $825.
The lowest price recently found on this route was $746.

What is the cheapest month to fly to Sofia?

The cheapest month to fly to Sofia from St. Louis is in October. Flight prices, which tend to average around $0, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of October, then book flights to Sofia from St. Louis during January instead. Flights to Sofia in January, while not as cheap as those in October, still average around $528.

When to book flights from St. Louis to Sofia

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Sofia according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Sofia (STL to SOF) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Sofia

Fastest flight time

13h 45m

Direct flights

None
The fastest flight from St. Louis to Sofia takes 13h 45m
There are no direct flights from St. Louis to Sofia. There are no popular flight routes from St. Louis to Sofia.
Search flight deals

Frequently asked questions about flying from St. Louis to Sofia

  • How far is Lambert-St Louis to Sofia by plane?

    A flight from Lambert-St Louis to Sofia will travel around 5441.0 mi. 13h 45m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Sofia Airport?

    Prices for flights from Lambert-St Louis Airport to Sofia Airport are updated daily.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Sofia Airport?

  • How old do you have to be to fly from Lambert-St Louis Airport to Sofia Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Sofia Airport.

  • What documentation or ID do you need to fly to Sofia Airport?

    The travel and health documents you'll need for your trip to Sofia Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Sofia Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from St. Louis to Sofia?

Best airlines flying from St. Louis to Sofia

Compare and see reviews for airlines that fly from St. Louis to Sofia with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $559Free CancellationRating
7.4
10,089 reviews
Search United Airlines flights
LufthansaPriceFrom $560Free CancellationRating
6.8
8,175 reviews
Search Lufthansa flights
Air CanadaPriceFrom $1,108Free CancellationRating
7.1
11,455 reviews
Search Air Canada flights

Traveling to a place near Sofia?

Book flights to Sofia if you plan to visit one of these locations
Bansko
Borovets
Velingrad
Sandanski

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Sofia?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from St. Louis to Sofia. momondo saves you time and could save you money on your trip.

Can I find flights from St. Louis to Sofia with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Sofia from St. Louis with this policy.

How can momondo help me find flights from St. Louis to Sofia?

Once all potential St. Louis to Sofia flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from St. Louis to Sofia right now. Can momondo alert me if prices change?

Price alerts on flights to Sofia from St. Louis are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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Fly your favorite airline to Sofia

Airlines are sorted and displayed according to clicks in the past 7 days on momondo
Lufthansa
United Airlines
Air Canada